diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-128/s_frexpl.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-128/s_frexpl.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128/s_frexpl.c b/REORG.TODO/sysdeps/ieee754/ldbl-128/s_frexpl.c new file mode 100644 index 0000000000..47a171f551 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-128/s_frexpl.c @@ -0,0 +1,54 @@ +/* s_frexpl.c -- long double version of s_frexp.c. + * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: $"; +#endif + +/* + * for non-zero x + * x = frexpl(arg,&exp); + * return a long double fp quantity x such that 0.5 <= |x| <1.0 + * and the corresponding binary exponent "exp". That is + * arg = x*2^exp. + * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg + * with *exp=0. + */ + +#include <math.h> +#include <math_private.h> + +static const _Float128 +two114 = L(2.0769187434139310514121985316880384E+34); /* 0x4071000000000000, 0 */ + +_Float128 __frexpl(_Float128 x, int *eptr) +{ + u_int64_t hx, lx, ix; + GET_LDOUBLE_WORDS64(hx,lx,x); + ix = 0x7fffffffffffffffULL&hx; + *eptr = 0; + if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */ + if (ix<0x0001000000000000ULL) { /* subnormal */ + x *= two114; + GET_LDOUBLE_MSW64(hx,x); + ix = hx&0x7fffffffffffffffULL; + *eptr = -114; + } + *eptr += (ix>>48)-16382; + hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL; + SET_LDOUBLE_MSW64(x,hx); + return x; +} +weak_alias (__frexpl, frexpl) |